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To create a controlled chain reaction and make use of the energy produced, the neutrons need to interact with the fissionable uranium at the right rate Most of the neutrons released by the fission of 235U atoms are 92 moving at high speeds These are called fast neutrons In addition, naturally occurring uranium consists of less than one percent 235U and more 92 than 99 percent 238U When a 238U nucleus absorbs a fast neutron, it does 92 92 not undergo fission, but becomes a new isotope, 239U The absorption of 92 neutrons by 238U keeps most of the neutrons from reaching the fissionable 92 235U atoms Thus, most neutrons released by the fission of 235U are unable 92 92 to cause the fission of another 235U atom 92 To control the reaction, the uranium is broken up into small pieces and placed in a moderator, a material that can slow down, or moderate, the fast neutrons When a neutron collides with a light atom it transfers momentum and energy to the atom In this way, the neutron loses energy The moderator thus slows many fast neutrons to speeds at which they can be absorbed more easily by 235U than by 238U The larger number of slow 92 92 neutrons greatly increases the probability that a neutron released by the fission of a 235U nucleus will cause another 235U nucleus to fission If there 92 92 is enough 235U in the sample, a chain reaction can occur To increase the 92 amount of fissionable uranium, the uranium may be enriched by adding more 235U Both types of uranium are used in nuclear reactors 92

directive), then you have to put the IBOutlet keyword in the property declaration, not in the instance variable declaration, in order for it to work correctly. Although both work, we re going to follow Apple s lead and put the IBOutlet keyword on the property declaration, for the most part. In some of our applications, we ll have outlets to objects without any matching properties, and in those cases we ll put the IBOutlet keyword in front of the instance variable declaration. You can read more about the new Objective-C properties in the second edition of Learn Objective-C on the Mac, by Mark Dalrymple and Scott Knaster (Apress, 2008), and in The Objective-C 2.0 Programming Language available from Apple s developer site at: http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/ObjC.pdf

Containment structure Steam turbine (generates electricity) Control rods Steam Steam generator Heat exchanger Pump Pump Large body of water

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Figure 30-8 In a nuclear power plant, the thermal energy released in nuclear reactions is converted to electric energy

The type of nuclear reactor used in the United States, the pressurized water reactor, contains about 200 metric tons of uranium sealed in hundreds of metal rods The rods are immersed in water, as shown in Figure 30-7 Water not only is the moderator, but also transfers thermal energy away from the fission of uranium Rods of cadmium metal are placed between the uranium rods Cadmium absorbs neutrons easily and also acts as a moderator The cadmium rods are moved in and out of the reactor to control the rate of the chain reaction Thus, the rods are called control rods When the control rods are inserted completely into the reactor, they absorb enough of the neutrons released by the fission reactions to prevent any further chain reaction As the control rods are removed from the reactor, the rate of energy release increases, with more free neutrons available to continue the chain reaction Energy released by the fission heats the water surrounding the uranium rods The water itself doesn t boil because it is under high pressure, which increases its boiling point As shown in Figure 30-8, this water is pumped to a heat exchanger, where it causes other water to boil, producing steam that turns turbines The turbines are connected to generators that produce electrical energy Fission of 235U nuclei produces Kr, Ba, and other atoms in the fuel rods 92 Most of these atoms are radioactive About once a year, some of the uranium fuel rods must be replaced The old rods no longer can be used in the reactor, but they are still extremely radioactive and must be stored in a location that can be secured Methods of permanently storing these radioactive waste products currently are being developed

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